Apple PCs' & Laptops

Hello!
Although I do not own Apple PCs' or Laptops, I was recently told that they do not need anti-virus software or any other system programs such as SuperAntiSpyware or CCleaner. Is this true? I did see that Pilform released a version of CCleaner for Macs so I wanted to get the correct answer(s) from one or more of you.

I do have an iPhone but not by choice. I have wondered often what browsing the web does to it. Clearing history, cache and cookies can't possibly be enough.

It's true - Mac viruses really do exist, although fewer viruses target the Mac OS compared to Windows. In addition, there are cross-platform threats that can impact Mac users. Though the risk of cross-platform threats is relatively small, it's a risk that is on the increase as attackers move to Java and other third-party software exploits.